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Experimental investigations of fuel film evaporation with deposit formation

Hänichen, Philipp and van Eyk, Maximilian and Stephan, Peter (2018):
Experimental investigations of fuel film evaporation with deposit formation.
In: International Journal of Heat and Fluid Flow, pp. 125 - 130, 70, ISSN 0142-727X,
DOI: 10.1016/j.ijheatfluidflow.2018.02.001,
[Online-Edition: https://doi.org/10.1016/j.ijheatfluidflow.2018.02.001],
[Article]

Abstract

A new test rig has been designed to investigate the effect of carbon based deposit layer formation on the hydrodynamics and heat transfer of a thin evaporating methylnaphthalene film, which builds deposits at a hot wall under thermal stress in an oxidative environment. The liquid film is shear driven by a preconditioned air flow, spread on a foil heater (joule heating) and evaporates. With a black and white camera the hydrodynamics of the moving film is visualized, whereas the temperature field below the foil is qualitatively measured with an IR camera. Prior to conducting the measurements the foil is wetted and dried periodically multiple times to form an initial deposit layer. For the main investigations the deposit layer is removed locally. The presented recordings show a direct effect of the deposit layer on wetting and heat transfer, and thus the ongoing deposit formation. Deposit layers are preferably wetted and act as thermal barriers leading to local higher wall temperatures and thus to a reduced foil cooling.

Item Type: Article
Erschienen: 2018
Creators: Hänichen, Philipp and van Eyk, Maximilian and Stephan, Peter
Title: Experimental investigations of fuel film evaporation with deposit formation
Language: English
Abstract:

A new test rig has been designed to investigate the effect of carbon based deposit layer formation on the hydrodynamics and heat transfer of a thin evaporating methylnaphthalene film, which builds deposits at a hot wall under thermal stress in an oxidative environment. The liquid film is shear driven by a preconditioned air flow, spread on a foil heater (joule heating) and evaporates. With a black and white camera the hydrodynamics of the moving film is visualized, whereas the temperature field below the foil is qualitatively measured with an IR camera. Prior to conducting the measurements the foil is wetted and dried periodically multiple times to form an initial deposit layer. For the main investigations the deposit layer is removed locally. The presented recordings show a direct effect of the deposit layer on wetting and heat transfer, and thus the ongoing deposit formation. Deposit layers are preferably wetted and act as thermal barriers leading to local higher wall temperatures and thus to a reduced foil cooling.

Journal or Publication Title: International Journal of Heat and Fluid Flow
Volume: 70
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Transregios
DFG-Collaborative Research Centres (incl. Transregio) > Transregios > TRR 150 Turbulent chemisch reagierende Mehrphasenströmungen in Wandnähe
Profile Areas
Profile Areas > Thermo-Fluids & Interfaces
Date Deposited: 16 Mar 2018 16:16
DOI: 10.1016/j.ijheatfluidflow.2018.02.001
Official URL: https://doi.org/10.1016/j.ijheatfluidflow.2018.02.001
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